Capital gains tax in Idaho (2026): selling a business, real estate or farm

Idaho's 60% deduction is the whole story for land, ranch and plant sellers

Idaho starts with a flat 5.3% rate on taxable income above $5,000 for joint filers (Idaho Code 63-3024, unchanged for 2026), then gives back a large share for Idaho assets. Under Idaho Code 63-3022H, an individual deducts 60% of the capital gain net income from the sale of qualified Idaho property. On qualifying gain, that leaves 40% taxed at 5.3%, an effective state rate of about 2.12% (2026).

Federal rates apply on top: long-term gain is taxed at 0%, 15% or 20%, with 20% above $613,700 of joint taxable income in 2026 (Rev. Proc. 2025-32), plus the 3.8% net investment income tax under IRC 1411. See the capital gains hub.

What counts as qualified Idaho property

The property must have an Idaho situs when sold and be one of the following (63-3022H(3), 2026):

• Real property held at least 12 months, which by statute includes a qualified conservation easement, federal and state grazing permits transferred with the base property, and Section 1250 property conveyed in perpetuity.
• Tangible personal property used in Idaho for at least 12 months by a revenue-producing enterprise, a term limited to producing, manufacturing or processing agricultural, mineral or manufactured products; storing or wholesaling them; feeding livestock at a feedlot; and research labs.
• Cattle or horses held for breeding, draft, dairy or sporting use at least 24 months in Idaho, and other breeding livestock held 12 months.
• Idaho-grown timber held at least 24 months.
• A partnership interest held 12 months, but only for the part of the gain attributable to qualifying Idaho real property, measured by appraisal, assessor value or an adjusted-basis ratio (63-3022H(3)(f)).

Two exclusions surprise sellers. Equipment of a retailer, restaurant, contractor or service business is not used by a "revenue-producing enterprise" as Idaho defines it, so its gain gets no deduction. And property depreciated under Section 1245 cannot be treated as real property (63-3022H(7)). Gains the Internal Revenue Code treats as ordinary income, such as recapture, never qualify (63-3022H(2)). Farm specifics: capital gains tax on farmland and timber sale taxes.

Worked example: why selling stock costs more in Idaho

The Idaho State Tax Commission lists stocks, bonds and interests in an S corporation among the property that does not qualify. In the first example a Boise couple sells their S corporation shares; the full gain is taxed at 5.3%, so Idaho tax is $106,000 and the total bill is $578,345 (2026). Had the same $2 million been gain on Idaho farmland held more than a year, 60% ($1.2 million) would be deducted and Idaho would tax $800,000, roughly $42,400 at 5.3%.

The second example shows the other lever: the same couple, already Nevada residents before the sale, owes $472,345, a difference of $106,000. Shares follow the owner's residence, while Idaho land stays taxable in Idaho wherever you live. If you are weighing a move, read changing residency before a sale first.

Asset sale or stock sale: Idaho tilts the answer

Because the deduction attaches to qualifying assets, an S corporation that sells its Idaho real estate and qualifying manufacturing or agricultural equipment passes qualifying gain through to the owners, who can claim the deduction on Form CG (line 5 covers gains from S corporations and partnerships, 2025 form). Sell the shares instead and the same economic gain is intangible and fully taxed. For a company with valuable Idaho land, the state difference alone can be large enough to discuss with the buyer, alongside the federal trade-offs in asset sale vs stock sale and the allocation rules in purchase price allocation.

Holding periods carry an Idaho twist: time the property was owned by a C corporation does not count, and property received in an exchange does not inherit the holding period of non-qualifying property given up (63-3022H(4)).

Installment sales, 1031 exchanges and Idaho basis

Seller financing works cleanly with the deduction. Form CG instructs sellers who used federal Form 6252 to compute the deduction each year on that year's taxable installment gain, and the gain qualifies if the holding period was met on the date of sale (Form CG instructions, 2025). A Section 453 installment sale of a ranch therefore keeps the 60% deduction on every payment while spreading the federal gain. Secure the note with a first-position deed of trust and default terms; see seller financing.

Idaho also computes depreciation and gain without federal bonus depreciation for property acquired after December 31, 2009, with special rules when federal losses were suspended (Idaho Code 63-3022O). If you took bonus depreciation federally, your Idaho basis is higher and your Idaho gain lower; keep the Idaho schedule handy at closing.

Nonresidents, filing and what Idaho does not charge

A nonresident with more than $2,500 of gross income from Idaho sources must file an Idaho return (Idaho Code 63-3030), and gain on Idaho land is Idaho-source. The 60% deduction is available to nonresidents on qualifying Idaho property, with part-year and nonresident owners of multistate entities computing it under Tax Commission rules (63-3022H(8)). The tax is settled on the nonresident return, so set aside cash from the closing.

Idaho has no estate tax on Idaho estates today, so the federal estate tax and the step-up at death drive the hold-or-sell decision for older owners. To compare an outright sale, a note, a 1031 exchange and holding, get the Big Sale Tax Analysis.

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